650 BELL SYSTEM TECHNICAL JOl'RSAL 



has given a luiiiprehiMisivi' airouni i>f lluin In I'liys. ZS. .'/ (1920), with a bibliog- 

 raphy of all of the work; two or three snhsf<nic-nt connminicalions are reviewed 

 in Science Al)stractrt. Bridgnian's work on the effect of pressure and of tension on 

 the electrical and thermal conductixities of the elements is printed chiefly in the 

 Proceedings oj the American Academy of Arts and Sciences from 1917 onward, with 

 occasional announcements in the I'hvsical Review, where also his theoretical papers 

 are publishe<l (Phys. Rev. ;.{, pp. 306-347 (1919i; 17, pp. 161-195 (1921) and /.9, 

 pp. 114-134 (1922). Kor the eflfect of melting, consult Bridgman's papers, and 

 one by von Hauer, in Ann. d. Phys. 61, pp. 189-219 (19161. 



The "classical" theory of conduction is presented in Lorcntz' book The Theory of 

 Electrons, which bears his signature as of 1915. Bohr wrote a dissertation upon it 

 which is highly praised by those who have succeeded in reading it in the Danish. 

 Wien's and Planck's modifications of it are published in the Sitziingsberichte of the 

 Berlin Academy for 1912 and 1913. In the Philosophical Magazine of 1915 there 

 are a number of articles on the theory by G. 11. Livens, like Baedeker a victim of 

 the war. The conception of quantity of free electrons determined by dissociation 

 of atoms is presented by Koenigsberger in Ann. d. Phys. S2, pp. 170-230 (1910) and 

 Waterman's extension of it is in Phys. Rev. ^^, pp. 259-270 (1923). Some chapters 

 in J. J. Thomson's Corpuscular Theory of Matter deal with the theories; in an article 

 in Phil. Mag. -iH (1915) he offers a theory involving an attempt on supra-conduc- 

 tivity, which the others do not touch. 



The field of therniionics is thoroughly covered in Richardson's Emission of Elec- 

 tricity from Hot Bodies (2d edition, 1921). Subsequent theoretical papers by Rich- 

 ardson are in Proc. Roy. Soc. AlUo, pp. 387-405 (1924) and Proc. Phys. Soc, London, 

 .%', i)p. 383-399 (1924), and one by H. A. Wilson on what 1 have called the "thermo- 

 dynaniical argument" in Phys. Rev. (2) J4, PP- 38-48 (1924). For various interpre- 

 tations of the surface double-layers see Debve, Ann. d. Phys. 33, pp. 440-489 ( 1910); 

 Schottky, ZS. f. I'hys. /.{, pp. 63-106 (1923)'; and Krenkel,'Phil. Mag. i.'.. pp.297-322 

 (1917). Cernier's investigation of the distribution-in-energy of thermionic electrons 

 is briefly reported in Science, .'f2, 392 (1923), and a fuller account is to be published; 

 Davisson and (iermer's determination of L in Phys. Rev. ^0, pp. 300-330 (1922). 

 For the photoelectric measurements establishing equation (12), consult Millikan, 

 Phys. Rev. 7, pp. 355-388 (1916); for the relation between values of P and contact- 

 potential-dilTerence consult Page, .\m. Journ. Sci. 36, pp. 501-508 (1913) and Milli- 

 kan, Phys. Rev. 7, pp. 18-32 (1916). Values of the thermionic constant h are tabu- 

 lated in Richardson's book and in Dushnian's article, Phys. Rev. (2) ^!, pp. 623-636 

 (1923). \alues of the photoelectric constant P arc tabulated by Kirchner, I'hvs. 

 ZS. ^;, i.p. 303-306 (1924) and by Hamer (Journ. Opt. S(k. .9, pp. 251-257 (1924). 

 For the arguments that the constant C of ecjuation (2i) is a universal constant, 

 consult the references given by Dushman (/. c. supra) and Richardson, Phys. Rev. 

 (2) :iJ, pp. 153-155 (1924); for the data, Dushman in Phys. Rev. (2) J3, p. 156 (1924). 



